CRGO 0.23mm Prime & Slit Coils: Key for Efficient Transformers

Efficient and reliable power distribution depends heavily on the quality of transformer cores, and at the heart of every high‑efficiency transformer lies Cold Rolled Grain Oriented (CRGO) electrical steel. Among all available grades, 0.23 mm CRGO is considered the premium and most widely accepted thickness for modern distribution and power transformers due to its superior magnetic properties and low core losses.

In India, where power demand continues to rise and grid efficiency is under constant scrutiny, CRGO steel has become a strategic material. With domestic production meeting only a small portion of national demand, every available coil of 0.23 mm CRGO prime material plays a critical role in sustaining transformer manufacturing and power infrastructure development.

Understanding CRGO Steel and Its Importance

CRGO steel is specially processed so that its grain structure is oriented in the rolling direction. This alignment allows magnetic flux to pass through the transformer core with minimal resistance, resulting in lower hysteresis loss, reduced eddy current loss, and improved overall efficiency.

Because transformers operate continuously, even small reductions in core loss translate into massive energy savings over their service life. This is why CRGO steel is universally recognized as essential for transformer core manufacturing, especially for energy‑efficient designs.

Mother Coil vs Slit Coil – What’s the Difference?

CRGO Prime Mother Coil

A mother coil is a full‑width CRGO coil supplied directly from the steel mill, typically ranging from 900 mm to 1250 mm in width. These coils are annealed, properly insulated, and packed to preserve magnetic properties. Transformer manufacturers and core cutting units use mother coils as the base material for further processing.

Key advantages:

• Uniform grain orientation

• Maximum flexibility for custom cutting

• Preferred for large‑scale transformer core production

  
  

CRGO Slit Coil

Slit coils are produced by precision slitting of mother coils into narrower widths as per transformer design requirements. The slitting process is done carefully to retain grain orientation and insulation integrity.

Key advantages:

• Ready‑to‑use widths for lamination cutting

• Reduced material wastage

• Faster production cycles for OEMs

Both mother coils and slit coils are indispensable in transformer manufacturing, and availability of both formats ensures smoother supply chains for OEMs and core cutting units.

Standard Specifications of 0.23 mm CRGO

The 0.23 mm thickness is the industry benchmark for high‑efficiency transformers in India. As per BIS and international standards, this thickness is commonly associated with M4 or equivalent high‑permeability grades, offering excellent performance at operating flux densities.

Key specification highlights:

• Nominal thickness: 0.23 mm

• Low specific core loss at 1.7 Tesla

• High permeability and consistent magnetic performance

• Suitable for energy‑efficient distribution and power transformers

Why 0.23 mm CRGO Is Ideal for Transformers

High Magnetic Permeability

The grain‑oriented structure allows higher magnetic flux density with lower magnetizing current, improving transformer efficiency.

Low Core Loss

Thinner laminations significantly reduce eddy current losses, ensuring less heat generation and better long‑term performance.

Energy Efficiency Compliance

With tightening efficiency norms, including star‑label requirements for distribution transformers, 0.23 mm CRGO has become a necessity rather than an option for compliant designs.

Longer Transformer Life

Lower losses mean reduced thermal stress, contributing to longer insulation life and improved transformer reliability.

Current CRGO Market Trends in India

India’s CRGO market continues to remain supply‑constrained despite growing demand. The power and renewable energy sectors are expanding rapidly, driving sustained requirements for high‑grade transformer core materials.

Key Market Observations

• Demand Growth: CRGO demand in India is growing at an estimated 10–12% annually, supported by grid expansion and renewable integration.

• Transformer Industry Expansion: India’s transformer market is projected to cross ₹40,000 crore by FY26, driven by infrastructure upgrades and replacement of old transformers.

• Supply Shortfall: Domestic CRGO production meets only a fraction of demand, leading to continued dependence on imports and a persistent material gap.

• Efficiency Regulations: New BEE distribution transformer efficiency norms effective from January 2025 are accelerating adoption of high‑grade 0.23 mm CRGO (M4 and better).

• Gradual Market Pickup: After a period of muted activity, the market is witnessing a slow but steady improvement in order flow, particularly from OEMs preparing for upcoming government and utility tenders.

While demand is improving, the supply situation remains tight, keeping the market stable and disciplined.

S M Steels – Premium 0.23 mm CRGO Coils Available

At S M Steels, we specialize in sourcing and supplying premium‑quality 0.23 mm CRGO materials for transformer manufacturers across India. Our focus is on consistent quality, reliable supply, and fast movement of high‑demand grades.

Our Offering

• 0.23 mm CRGO Prime Mother Coils

• 0.23 mm CRGO Precision Slit Coils

• Grades: M4 / M3 (and equivalent BIS grades)

• Oily and dry material options

Why Choose S M Steels

• OEM‑preferred, fast‑moving grades

• BIS/ISO‑compliant material

• Consistent magnetic performance

• Advance booking and fair allocation

• Pan‑India logistics and quick dispatch

Most of our 0.23 mm CRGO stock moves quickly due to strong OEM demand, making early enquiry and booking essential.

Enquire Now for 0.23 mm CRGO Coils

If you are a transformer manufacturer, core cutting unit, or OEM looking for reliable 0.23 mm CRGO prime or slit coils, S M Steels is your trusted sourcing partner.

Contact S M Steels

S M Steels CRGO Core Materials | Prime & SecondaryPan-India Supply | Fast Dispatch

📍 Address:Plot No: D51, First Floor, F-4, Sathangadu Iron and Steel Market,Manali, Chennai – 600068, Tamil Nadu, India

📞 Phone: +91 89394 61720 📱WhatsApp DM: +91 89394 61720 📧 Email: smsteelschennai@gmail.com

🌐 Website: https://www.smsteels.org

🕒 Business Hours: Monday to Sunday – 7 Days a Week

Contact us today to check current availability, grade options, and quick dispatch schedules for 0.23 mm CRGO prime mother coils and slit coils.